| UAV is now widely used in civil and military areas. And the security and reliability of UAV TT&C link is more and more challenging. This thesis discussed the reliable data transmission of UAV TT&C link with low elevation channel.There are two types of UAV TT&C link:uplink and downlink. Uplink is the transmission channel from ground station to UAV, usually delivering narrowband information. Downlink is the transmission channel from UAV to ground station, usually delivering broadband information, according to specific features of uplink and downlink, relevant multipath mitigation approaches is proposed in this paper.Uplink is featured with low speed transmission. And RAKE reception is adopted to enhance receiver performance and improve system adaptability in multipath environment. Validation for this technique was also provided.Downlink is featured with high speed transmission. And OFDM technique is adopted for multipath mitigation in wireless broadband environment. Detailed investigation and validation was also provided.Investigation results showed that RAKE and OFDM technique can effectively eliminate the effect of multipath delay interference and facilitate reliable data transmission of UAV TT&C link with low elevation channels. |
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